- simplify LassoSPKitUtilsSession using generic getters/setters. DONE
- implements id-ff 1.2 version of all functionalities. still no endpoints...
- support full nameidmanagement protocol. DONE
- move metadata support into LassoSPKitMetatada class. DONE
- endpoints to retrieve metadatas. DONE
- use LassoSPKitUtilsSession in findFederation, saveFederation et
  changeFederation. DONE
- create LassoSPKitEndpoint to share implementation between liberty and SAML 2
  TODO
- when using file system as a federation database manage locks to prevent from
  parkinsonian users